﻿BOLBOCERATESri 
  OF 
  THE 
  UNITED 
  STATES 
  — 
  CARTWRIGHT 
  117 
  

  

  eye 
  by 
  a 
  distinct 
  rather 
  deep 
  foveola; 
  base 
  margined. 
  Scutellum 
  tri- 
  

   angular, 
  with 
  base 
  straight, 
  sides 
  arcuate. 
  Elytra 
  not 
  margined 
  at 
  

   base; 
  seven 
  discal 
  striae, 
  the 
  first 
  two 
  interrupted 
  by 
  the 
  scutellum, 
  

   the 
  second 
  sometimes 
  indistinctly 
  forked 
  opposite 
  the 
  apex 
  of 
  scutel- 
  

   lum. 
  Two 
  prosternal 
  spines 
  in 
  tandem 
  behind 
  anterior 
  coxae, 
  the 
  

   posterior 
  more 
  or 
  less 
  hastate. 
  Metasternal 
  plate 
  rhomboid 
  in 
  shape, 
  

   the 
  posterior 
  angle 
  acute 
  and 
  with 
  adjacent 
  edges 
  cariniform, 
  the 
  

   lateral 
  angles 
  with 
  adjacent 
  edges 
  rounded; 
  the 
  intercoxal 
  lobe 
  deeply 
  

   concave 
  and 
  with 
  strong 
  cariniform 
  lateral 
  edges. 
  

  

  Genotype.^ 
  — 
  Brady 
  cinetus 
  carinatus 
  Schaeffer, 
  1906 
  = 
  Bolboceras 
  

   schaefferi 
  Boucomont. 
  

  

  Key 
  to 
  the 
  species 
  of 
  Bolborhombus 
  

  

  1. 
  Clj'peus 
  of 
  male 
  carinately 
  margined 
  in 
  front, 
  the 
  very 
  wide 
  clypeal 
  horn 
  

  

  arcuate 
  anteriorly, 
  a 
  low 
  sharp 
  carina 
  arcuate 
  in 
  opposite 
  direction 
  behind 
  

   the 
  clypeal 
  horn, 
  which 
  is 
  midway 
  between 
  this 
  and 
  the 
  carinate 
  anterior 
  

  

  margin; 
  female 
  unknown 
  angulus 
  (Robinson) 
  

  

  Male 
  clypeus 
  not 
  distinctly 
  carinate 
  along 
  anterior 
  edge 
  but 
  with 
  parallel 
  

   carinae 
  extending 
  back 
  from 
  anterior 
  angles 
  to 
  the 
  external 
  angles 
  of 
  the 
  tip 
  

   of 
  the 
  horn 
  2 
  

  

  2. 
  Postapical 
  carina 
  of 
  pronotum 
  sharp 
  and 
  slightly 
  undercut; 
  male 
  with 
  short, 
  

  

  distinct 
  carina 
  back 
  of 
  clypeal 
  horn 
  arcuate 
  anteriorly, 
  in 
  same 
  direction 
  

   as 
  clypeal 
  horn; 
  female 
  smoother 
  back 
  of 
  corresponding 
  carina 
  than 
  in 
  

   front 
  of 
  it; 
  small 
  shining 
  species; 
  8 
  to 
  10 
  mm. 
  (Baja 
  California) 
  . 
  

  

  parvulus 
  new 
  species 
  

   Postapical 
  carina 
  of 
  pronotum 
  rounded; 
  male 
  without 
  carina 
  or 
  with 
  faint 
  

   indication 
  of 
  two 
  low 
  obscure 
  tubercles 
  back 
  of 
  clypeal 
  horn; 
  female 
  equally 
  

   rough 
  behind 
  and 
  in 
  front 
  of 
  carina; 
  usually 
  dull 
  or 
  only 
  moderately 
  shining 
  

   (excepting 
  some 
  very 
  large 
  specimens, 
  which 
  may 
  represent 
  a 
  subspecies) 
  ; 
  

   larger 
  species, 
  11 
  to 
  18 
  mm 
  schaefferi 
  (Boucomont) 
  

  

  Bolborhombus 
  angulus 
  (Robinson), 
  new 
  combination 
  

  

  Figure 
  14, 
  6 
  

  

  Bolboceras 
  angulus 
  Robinson, 
  Trans. 
  Amer. 
  Ent. 
  Soc, 
  vol. 
  73, 
  p. 
  170, 
  1947. 
  

  

  Bolborhombus 
  angulus 
  (Robinson) 
  is 
  a 
  small 
  rufotestaceous 
  species, 
  

   7 
  to 
  11 
  mm. 
  in 
  length, 
  readily 
  recognized 
  by 
  the 
  form 
  of 
  the 
  head 
  and 
  

   clypeus. 
  The 
  wide 
  straight 
  anterior 
  edge 
  of 
  the 
  clypeus 
  is 
  strongly 
  

   carinately 
  margined. 
  Behind 
  this, 
  from 
  side 
  to 
  side 
  and 
  almost 
  in 
  

   line 
  with 
  the 
  anterior 
  edges 
  of 
  the 
  ocular 
  canthi, 
  is 
  a 
  moderately 
  high 
  

   anteriorly 
  arcuate 
  ridge 
  or 
  horn, 
  and 
  still 
  farther 
  back 
  a 
  lower 
  poste- 
  

   riorly 
  arcuate 
  sharp 
  carina. 
  The 
  median 
  horn 
  tends 
  to 
  become 
  some- 
  

   what 
  nodose 
  at 
  the 
  ends 
  and 
  is 
  approximately 
  midway 
  between 
  the 
  

   posterior 
  carina 
  and 
  the 
  carinate 
  anterior 
  edge 
  of 
  the 
  clypeus. 
  In 
  

   other 
  characters 
  angulus 
  is 
  very 
  similar 
  to 
  B. 
  parvulus 
  and 
  to 
  small 
  

   specimens 
  of 
  B. 
  schaefferi 
  (Boucomont). 
  

  

  Type. 
  — 
  In 
  Alark 
  Robinson 
  collection, 
  Philadelphia, 
  Pa. 
  

  

  